Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1991 Nissan-Datsun Sentra SE-RFACTORY OEM SERVICE PROCEDURE
Pressure Release
WARNING:
High fuel pressure may be present in fuel lines and component parts. Always relieve fuel pressure before attempting to open system for component replacement. DO NOT allow fuel to flow onto engine or electrical parts. DO NOT allow open flame in area while testing fuel system components.
- To relieve fuel system pressure on 300ZX models, remove fuel pump relay. Relay is located underdash on driver's side below hood release lever. On all other models, remove fuel pump fuse.
- On all models, start engine and allow to run until fuel is exhausted and engine stalls. Crank engine an additional 2 or 3 times to verify all pressure has dissipated. Turn ignition off. Install fuel pump fuse or relay.
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.